User's Guide

2110059 Rev 1.0 Proprietary and Confidential Page 89
10. Multipurpose Interface Board
10.1. Introduction
The Multipurpose Interface Board (MIB) is a
development aid to facilitate testing and configuration
of the SB300 Series modems by allowing
communication using a standard RS-232 serial
connection. It also provides monitoring LEDs, test
points, connections for a protocol analyzer, and
connections for wireline (PSTN) hookup.
There is also support for the SB220 and SB301
modem. These supports are provided for factory level testing only and are beyond the scope of
this document. The SB302 shares several connectors and signal controls with the SB301.
NOTE
Although the MIB provides support for the full SB Series of modems, it is not intended
to support more than one modem at a time. Attaching more than one modem can
damage circuitry.
For a quick initial setup go to Section 10.8. To get a fuller understanding of the board’s
connections and capabilities sections are provided as follows:
• Section 10.2 Board Description with schematic and parts layout reference.
• Section 10.3 Power Supply including voltage control and supplying power from a host device.
• Section 10.4 Connections describing the various host, modem, and analyzer connectors.
• Section 10.5 Jumpers details options and setups.
• Section 10.6 Serial Breakout Box describes cross wiring correction and signal checking
• Section 10.7 Test Points identifies what is offered and where to find it
10.1.1. Features
The MIB offers these features:
• Supports SB220, SB300, SB302, SB320
• RS232 to 5V HCMOS conversion
• Interception of 5V HCMOS control signals from host to modem to verify syntax and levels
• Intercepted signals are converted to RS-232 for observation by standard serial port
• Supports wireline access
• Serial port breakout box to resolve cabling difficulties
• Serial port status LEDs
• Status line LEDs and pullup/down
• Current, DISC and KEY test points
• Reset button for SB300 and SB320
• Annunciator to hear dial tones
• Comm Analyzer connectors - 25 pin protocol analyzer
• Uses wall adapter for power